Plug retainer



March 4, 1930.

F. w. JACKSON 1,749,287

I PLUG RETAINER Filed DC. 27, 1928 gwventot f v15 for holding a I devicethereon; I Figure 2 is a like view to Figure 1 but Patented Mar- 4,1930

,FREDERIGK wJJAcKsoN, 01m 'nnnnnus onnrmnnra-i PLUG nnramnnw Applicationfiled. December 27,1928, Serial .No. 328 ,789

This invention relates to a device adapted to be associated wth atubular body for a holding a plug or like closure against accidentaldisplacement within the tubular body and the general objectis to providean 'provementupon the construction illustrated a in my patent granted onMarch 25, 1924, No.

1,488,393 and to provide aconstruction which is simpler to manufacture,cheaper in cost and equally efiective as a means for holding I the plugin place. My invention is illustrated in the accom panying drawing,wherein I I v Figure 1 is a face view of a tubular body plug,-with myplug retaining showing the retaining; device turned in'its inoperativeposition; Figure 3 is a I Figure 1;

section-on the line 83 of- Figure 4 is a section on the line 4-4 ofFigure 1. J

Referring to the drawing, 10 designates a tubular member and 11 apluhaving screwthreaded engagement therewith, the extremity of the plugbeing'formed with a socket 12 whereby a. socket wrench may beapplied toremove the plug from its engagement with l the tubular member.

The tubular member is illustrated as being reduced .at one end andexteriorly screwthreaded at 13 but I do not, of course, wish to belimited to this.

The tubular member is formed With a late y eral projection 14 which ischanneled upon I its outer face to provide opposed walls15. Thisprotuberant portion or lug ,14 is vertically bored at 16. The walls 15upon their upper surfaces are rounded. Extending through the bore 16is ashank 17 having at i its upper end, a head 18. I The lower end of theshank 17 is screw-threaded for the receplength that when the head isturned into alinement with the channel formed between the walls 15,thefree end of thehead will projectover the plug 11 and, therefore, pre

tion' of" a nut 19. and disposed between this I nut and theun'der'faceof the lug 14 is a coin-' pression-spring 20. The head 18 is of such thehead 18 fii'nily down between the walls 1 \Vhen the head is pulledoutward or=tlie shank: forced outward so that the heads" clears thewalls"15, the head-may be -"otated to a position-at right angles to the:wa'llsf15' and rest upon the outer faces-thereofand'under these} cii'cumstancesthe plug will be =f-reeto be unscrewed. 'The tension-ofthespringa20 causes-the liead to" bear firmly' against the outer faces ofthe walls 15 but if the headibe rotated beyond a certain point theinwardly inclined or rounded faces of the walls 15 will cause thehead tosnap into place. It will be seen that the head may be turned from itsinoperative position in either direction toward its operative positionand it will snap into place and lock the plug from withdrawal. The nut19 is preferably held in place upon the shank 17 by means of a cotterpin or other key. It will be seen that this construction is very simple,is thoroughly effective, that it may be much more cheaply made than theconstruction illustrated in my prior patent and that the head cannot beaccidently turned away from its locking position unless the headbe'forcibly shifted beyond the outer faces of the walls 15.

- Itwill be likewise seen that these angled the walls and thus place afinal tension upon the spring which will hold the head firmly in itsinoperative position.

I claim 1. In a device of the character described, atubular member, aplug engaged therewith and means for retaining the plug againstaccidental displacement comprising a 'lug projecting from the tubularmember and having a Wall extending substantially radially with referenceto the plug,the stem extending through said lug and carrying a head atits outer end, a spring urging the stem in a direction to carry the headtoward the lug, the head being rotatable into a position parallel withthe wall offithe lug or at right angles thereto when the head and thestem are lifted against the action of the spring, the outer face of saidWall being inclined from its middle in'opposite directions.

2. A' device of the character described, comprising a tubular member, aplug therefor and means for retaining the plug against accidentaldisplacement comprising a lug projecting: from the tubular member andhaving a radial groove upon its outer face; a head having a stemextending, through the lug, a spring urging the stem inward and I thehead against the outer faces" of the grooved Walls.

3. In a devi a tubular member, a plug therefor and means for retainingthe plug against accidental displacement comprising a lugprojecting fromthe tubular member and having a radial groove upon its outer face, ahead having a stem extending through the lug, a spring urging thesteminward and the head against the outer faces of the grooved Walls, the

Walls of said groove having their outer faces inclined towardthe planeof the edge face of the tubular member from a. middle point in oppositedirections.

In testimony whereof I hereunto: affix my signature. I a

-. FREDERICK W. JACKSON.

ce of the character describedp

